WebWorker JSON Parse - async json parsing

console-output.txt

VM818:24 Starting...
VM818:31 Buiding test Data: 6429.308837890625ms
VM818:35 1498727454505
VM818:37 Bloking event loop...
VM818:39 StandartParsing: 2425.947021484375ms
VM818:40 18000000
VM818:41 Event loop unblocked
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VM818:44 WebWorkerParsing: 5697.458984375ms
VM818:45 18000000

TestData.js

console.log('Starting...');
console.time('Buiding test Data');
const jsonData = {data:new Array(9000000)};
for (let i = 0; i < 9000000; i++) {
	jsonData.data.push(`el-${i}`);
}
const dataString = JSON.stringify(jsonData);
console.timeEnd('Buiding test Data');
const interval = setInterval(()=>{
	console.log(`${Date.now()} - event loop not blocked`);
},10);
console.log(Date.now());
console.time('StandartParsing');
console.log('Bloking event loop...');
const n = JSON.parse(dataString);
console.timeEnd('StandartParsing');
console.log(n.data.length);
console.log('Event loop unblocked');
console.time('WebWorkerParsing');
webWorkerJSONParse(dataString,(e)=>{
	console.timeEnd('WebWorkerParsing');
	console.log(e.data.length);
	clearInterval(interval);
});

web-worker-json-parse.js

function webWorkerJSONParse( data, callback) {
  if (typeof data !== 'string' || data.charAt(0)!=='{') {
    callback(data);
    return;
  }
  
  const WT = `
  function () {
    self.onmessage = function(e){
      self.postMessage(JSON.parse(e.data));
      self.close();
    };
  }
`;

  const worker =  new Worker(URL.createObjectURL(new Blob(["("+WT+")()"], {type: 'text/javascript'})));
  worker.onmessage = (e) => {
    callback(e.data);
  };
  
  worker.postMessage(data);
}